public override object Evaluate(NodeEvaluationContext evaluationContext)
{
var leftNodeValue = LeftNode.Evaluate(evaluationContext);
if (leftNodeValue != null)
{
return(leftNodeValue);
}
return(RightNode.Evaluate(evaluationContext));
}
public void parse_expression_parses_variable_expression()
{
using (var stringReader = new StringReader("{0}"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(3, expression.Evaluate(NodeEvaluationContext.Create(3)));
}
}
public override object Evaluate(NodeEvaluationContext evaluationContext)
{
var leftNodeValue = LeftNode.Evaluate(evaluationContext);
if (leftNodeValue != null)
{
return leftNodeValue;
}
return RightNode.Evaluate(evaluationContext);
}
public override object Evaluate(NodeEvaluationContext evaluationContext)
{
return(null);
}
/// <summary>
/// Attempts to convert the specified values.
/// </summary>
/// <param name="values">
/// The values to convert.
/// </param>
/// <param name="targetType">
/// The type of the binding target property.
/// </param>
/// <param name="parameter">
/// The converter parameter to use.
/// </param>
/// <param name="culture">
/// The culture to use in the converter.
/// </param>
/// <returns>
/// A converted value.
/// </returns>
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
this.EnsureExpressionNode();
exceptionHelper.ResolveAndThrowIf(this.expressionNode == null, "NoExpression");
return this.expressionNode.Evaluate(NodeEvaluationContext.Create(values));
}
public override object Evaluate(NodeEvaluationContext evaluationContext)
{
return null;
}
public override object Evaluate(NodeEvaluationContext evaluationContext)
{
return(this.value);
}
public void parse_expression_parses_complex_expressions()
{
using (var stringReader = new StringReader("1 + (8/3d) * (50 >> (3 - 1)) * 1e4"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(320001d, expression.Evaluate(NodeEvaluationContext.Empty));
}
using (var stringReader = new StringReader("\"a\"+\"b\" + \"c\" +\"def\" + \"\\nghi\" == {0}"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(true, expression.Evaluate(NodeEvaluationContext.Create("abcdef\nghi")));
Assert.Equal(false, expression.Evaluate(NodeEvaluationContext.Create("abcdefghi")));
}
using (var stringReader = new StringReader("23543L & 3448 | (1024 * 56) ^ 8948 ^ (548395 % 34853)"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(45044L, expression.Evaluate(NodeEvaluationContext.Empty));
}
using (var stringReader = new StringReader("~{0} * -{1} / {2}"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(177m, expression.Evaluate(NodeEvaluationContext.Create(235, 3m, 4)));
Assert.Equal(-279, expression.Evaluate(NodeEvaluationContext.Create(-32, 18, 2)));
}
using (var stringReader = new StringReader(@"{0} > 100 ? ({1} ?? {2} ?? ""default"") : ""small number"""))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal("small number", expression.Evaluate(NodeEvaluationContext.Create(99, "first", "second")));
Assert.Equal("first", expression.Evaluate(NodeEvaluationContext.Create(101, "first", "second")));
Assert.Equal("second", expression.Evaluate(NodeEvaluationContext.Create(101, null, "second")));
Assert.Equal("default", expression.Evaluate(NodeEvaluationContext.Create(101, null, null)));
}
using (var stringReader = new StringReader(@"{0} == {1}"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(true, expression.Evaluate(NodeEvaluationContext.Create(ConsoleKey.A, ConsoleKey.A)));
Assert.Equal(true, expression.Evaluate(NodeEvaluationContext.Create(ConsoleKey.A, (int)ConsoleKey.A)));
Assert.Equal(false, expression.Evaluate(NodeEvaluationContext.Create(ConsoleKey.A, ConsoleKey.B)));
Assert.Equal(true, expression.Evaluate(NodeEvaluationContext.Create(this, this)));
Assert.Equal(false, expression.Evaluate(NodeEvaluationContext.Create(this, expression)));
}
using (var stringReader = new StringReader(@"{0} != null && {1} == {2}"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(true, expression.Evaluate(NodeEvaluationContext.Create(this, ConsoleKey.A, ConsoleKey.A)));
Assert.Equal(false, expression.Evaluate(NodeEvaluationContext.Create(null, ConsoleKey.A, ConsoleKey.A)));
Assert.Equal(false, expression.Evaluate(NodeEvaluationContext.Create(this, ConsoleKey.A, ConsoleKey.B)));
}
using (var stringReader = new StringReader(@"{0} != null && {1} == {2}"))
using (var tokenizer = new Tokenizer(stringReader))
using (var parser = new Parser(tokenizer))
{
var expression = parser.ParseExpression();
Assert.Equal(true, expression.Evaluate(NodeEvaluationContext.Create(this, ConsoleKey.A, ConsoleKey.A)));
Assert.Equal(false, expression.Evaluate(NodeEvaluationContext.Create(null, ConsoleKey.A, ConsoleKey.A)));
Assert.Equal(false, expression.Evaluate(NodeEvaluationContext.Create(this, ConsoleKey.A, ConsoleKey.B)));
}
}
